[ODE] "Copying" Bodies

[Jaroslav Sinecky]

You don't get identical simulations so easily. You need to have EVERYTHING
identical in these paralel worlds, including radnom number generator state,
order of geoms, bodies, joints on respective lists etc. If not, you can get
significantly different results very soon after your last sincronization.
More on this in Wiki: http://ode.org/cgi-bin/wiki.pl?SaveAndRestoreHowTo or
searching through archives.

Jaroslav

> -----Original Message-----
> From: ode-bounces at q12.org [mailto:ode-bounces at q12.org]On Behalf
> Of Marcus Brubaker
> Sent: Saturday, November 05, 2005 3:06 AM
> To: ode at q12.org
> Subject: [ODE] "Copying" Bodies
>
>
> Ok, so I've been struggling with this for a while now and thought I
> would ask the ODE community what they thought.  I have an application
> where I have several worlds/spaces and within each of these is a set of
> bodies in various configurations.  In other words, each world has an
> identical model (same kind of geometry) but in a different state.
>
> At a point I need to set the state of a model in one world identical to
> the state of the model in another world.  To do this I simply set the
> position, quaternion, force, torque and linear and angular velocities of
> the bodies in one world equal to those of the body in the other world.
> In other words, I do things like
> dst.body1.setQuaternion(src.body1.getQuaternion())
>
> Seems like it should work, no?  Unfortunately whenever this is done I
> consistently get simulations with different results than in the original
> world (the one that was copied from).  Significantly different results.
> The only thing I can figure is if there is some body parameters that I'm
> missing.  Any ideas or suggestions would be greatly appreciated.
>
> Thanks,
> Marcus
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